<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	
	<body>
		
		
		<h1 id="mytitle">我是页面中的一个标题元素</h1>
	</body>
	<script type="text/javascript">
		let a = document.getElementById('mytitle');
		document.write(a)
	</script>
</html>
